Why do individual humans have such unique faces while animals have faces that are all similar? Is this purely perception? Are we actually just as similar looking to each other as the animals are?
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It is just perception.
This is why people sometimes say that all <insert race> look the same. We are better able to distinguish the features of individuals that we are surrounded by. Caucasians will have different colors of hair and eyes and focus on that. African Americans mostly have dark hair and eyes but a lot of different shades of skin and facial features.
There have been studies where people were shown different African American faces. Those who grew up in places with a higher African American population (and those who watched a lot of NBA basketball) were better able to distinguish individuals.
Animals don’t as much go by face but often have other identifiers (spots/stripes/smells) that help them to distinguish individuals and for them it as just as easy to tell Joe apart from Bob.
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